{
"user": {
"id": 42,
"name": "Ada Lovelace",
"active": true,
"roles": [
"admin",
"developer"
],
"profile": {
"timezone": "Asia/Beirut",
"lastLogin": "2026-06-06T10:20:00Z"
}
}
}Developer Tools is a free collection of 26 browser-based utilities for everyday programming work: formatting and converting JSON, decoding JWTs, encoding Base64 and URLs, testing regular expressions, comparing text, parsing cron schedules and generating UUIDs, hashes, passwords and QR codes. Every tool runs locally in your browser, so code, tokens and data never leave your device.
Yes. All 26 tools are free to use with no account, no usage limits and no ads blocking the workspace.
No. Every tool runs entirely in your browser with JavaScript. Pasted code, tokens, passwords and files stay on your device, and the tools keep working offline once loaded.
Derar Sattouf, a full-stack developer, built them to replace the dozen ad-heavy single-purpose sites developers usually juggle with one fast, private workspace.
Last updated: October 2026 · Built by Derar Sattouf